JPH08134B2 - Syringe and piston used in the syringe - Google Patents
Syringe and piston used in the syringeInfo
- Publication number
- JPH08134B2 JPH08134B2 JP5237439A JP23743993A JPH08134B2 JP H08134 B2 JPH08134 B2 JP H08134B2 JP 5237439 A JP5237439 A JP 5237439A JP 23743993 A JP23743993 A JP 23743993A JP H08134 B2 JPH08134 B2 JP H08134B2
- Authority
- JP
- Japan
- Prior art keywords
- hub
- piston
- arrow
- syringe
- cylindrical portion
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Infusion, Injection, And Reservoir Apparatuses (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、使い捨て使用するのに
好適な注射器に関する。FIELD OF THE INVENTION The present invention relates to a syringe suitable for disposable use.
【０００２】[0002]
【従来の技術】図７は、従来提案されている使い捨て注
射器の一例におけるシリンジ、ピストン間の位置関係を
示した模式図である。従来、使い捨て注射器において
は、使用直後に注射針を、手等が注射針を直接触れ得な
いシリンジ内に挿入させることにより、患者の血液等が
付着した注射針で手等を傷つけて二次感染する事故を防
止し得る、注射針収納機能を有した注射器が提案されて
いる。注射針収納機能を有した従来提案されている使い
捨て注射器において、その注射針収納動作は、ピストン
の操作により、該ピストンと注射針が接合されているハ
ブとを互いに係合させて、更にピストンによって、係合
されたハブを注射針と共にシリンジ内に引き入れる形で
行われる。また、ハブ、ピストン間の係合は、図７に示
すように、注射終了位置Ｐ１にあるピストン４２を更に
ハブ４０側に押圧することにより、ハブ４０のピストン
側の端部側に設けられたピストン係合孔４１に、ピスト
ン４２の先端に設けられたハブ係合部４３を圧入係合さ
せる形で行われる。なお、ピストン４２に設けられてい
るパッキン４５の先端面４５ａ側は注射終了位置Ｐ１に
おいて、シリンジ４６の内面４６ａ側に整合する形にな
っており、従って、注射終了位置Ｐ１にあるピストン４
２を更にハブ４０側に押圧することによって、パッキン
４５の略全体は軸方向に圧縮されることになる。2. Description of the Related Art FIG. 7 is a schematic view showing a positional relationship between a syringe and a piston in an example of a conventionally proposed disposable syringe. Conventionally, in disposable syringes, by inserting the injection needle immediately after use into a syringe that cannot be touched directly by the hands, etc., the hands, etc. are injured by the injection needle to which the patient's blood, etc. adheres and secondary infection occurs. There has been proposed a syringe having a function of accommodating an injection needle, which can prevent such an accident. In a conventionally proposed disposable syringe having a needle storing function, the needle storing operation is performed by operating a piston to engage the piston with a hub to which the needle is joined, and further by the piston. , The engaged hub is pulled into the syringe together with the injection needle. Further, as shown in FIG. 7, the engagement between the hub and the piston is provided on the end side of the hub 40 on the piston side by further pressing the piston 42 at the injection end position P1 toward the hub 40 side. The hub engagement portion 43 provided at the tip of the piston 42 is press-fitted into the piston engagement hole 41. The end surface 45a side of the packing 45 provided on the piston 42 is aligned with the inner surface 46a side of the syringe 46 at the injection end position P1, and therefore, the piston 4 at the injection end position P1.
By further pressing 2 toward the hub 40 side, substantially the entire packing 45 is axially compressed.
【０００３】[0003]
【発明が解決しようとする課題】しかし、パッキン４３
の略全体を軸方向に圧縮させるには比較的大きな力が必
要であるので、ピストン４２とハブ４０との係合には大
きな力が必要であった。従って、注射針収納動作におけ
る操作性は悪かった。本発明は、上記事情に鑑み、使い
捨て注射器において、極力小さな力でピストン４２とハ
ブ４０とを係合させることができ、それによって注射針
収納動作を容易に行い得る注射器を提供することを目的
としている。However, the packing 43 is used.
Since a relatively large force is required to axially compress substantially the whole of the above, a large force is required to engage the piston 42 and the hub 40. Therefore, the operability in the needle storing operation was poor. The present invention has been made in view of the above circumstances, and an object thereof is to provide a syringe capable of engaging the piston 42 and the hub 40 with a force as small as possible in the disposable syringe and thereby easily performing the needle accommodating operation. There is.
【０００４】[0004]
【課題を解決するための手段】即ち、本発明のうち第一
の発明は、筒部（３）を有し、前記筒部（３）の先端側
に、該筒部（３）の内径よりも小なる内径をもつ筒状の
ハブ挿着部（４）を、該筒部（３）と該ハブ挿着部
（４）との間に連絡部（６）を形成する形で設け、前記
ハブ挿着部（４）にハブ（９）を着脱自在に挿着して設
け、前記ハブ（９）の前記筒部（３）に背向した側に注
射針（２１）を接合して設け、前記ハブ（９）の前記筒
部（３）に対向した側にハブ側係合手段（１５）を設
け、前記筒部（３）にピストン本体（２５）を、該筒部
（３）の内部に挿入された形で設け、前記ピストン本体
（２５）にピストン側係合手段（３１）を、前記ハブ
（９）のハブ側係合手段（１５）に対向する形で、該ハ
ブ側係合手段（１５）に対して挿入係合自在に設け、前
記ピストン本体（２５）に弾性材料により形成された閉
塞手段（３３）を、該閉塞手段が前記筒部（３）の内部
を軸方向（矢印Ａ、Ｂ方向）に閉塞するとともに、前記
筒部（３）に対して、前記ピストン本体（２５）と共に
軸方向（矢印Ａ、Ｂ方向）に摺動移動自在に設け、前記
閉塞手段（３３）に、該閉塞手段（３３）の前記軸方向
（矢印Ａ、Ｂ方向）の移動により前記連絡部（６）に当
接し得る係止部（３５ｄ、５５）を形成し、前記閉塞手
段（３３）に押出し部（３５ｅ）を、前記係止部（３５
ｄ、５５）と前記連絡部（６）が当接する際に、該押出
し部（３５ｅ）と前記連絡部（６）間に隙間空間（５
１）が形成され得る形で形成して構成した。また、本発
明のうち第二の発明は、第一の発明の注射器（１）で使
用するピストン（２３）において、前記ピストン（２
３）はピストン本体（２５）を有し、前記ピストン本体
（２５）の先端側にピストン側係合手段（３１）を、前
記ハブ側係合手段（１５）に対して挿入係合自在に設
け、前記ピストン本体（２５）に弾性材料により形成さ
れた閉塞手段（３３）を、該閉塞手段（３３）が前記筒
部（３）の内部を軸方向（矢印Ａ、Ｂ方向）に閉塞し得
るともに、前記筒部（３）に対して、前記ピストン本体
（２５）と共に軸方向（矢印Ａ、Ｂ方向）に摺動移動自
在に設け、前記閉塞手段（３３）に、該閉塞手段（３
３）の前記筒部（３）に対する前記軸方向（矢印Ａ、Ｂ
方向）の移動により前記連絡部（６）に当接し得る係止
部（３５ｄ、５５）を形成し、前記閉塞手段（３３）に
押出し部（３５ｅ）を、前記係止部（３５ｄ、５５）と
前記連絡部（６）が当接する際に、該押出し部（３５
ｅ）と前記連絡部（６）間に隙間空間（５１）が形成さ
れ得る形で形成して構成した。なお、（ ）内の番号等
は、図面における対応する要素を示す、便宜的なもので
あり、従って、本記述は図面上の記載に限定拘束される
ものではない。以下の作用の欄についても同様である。That is, the first invention of the present invention has a tubular portion (3), and at the tip end side of the tubular portion (3), from the inner diameter of the tubular portion (3). A tubular hub insertion part (4) having a smaller inner diameter is formed in the form of forming a connecting part (6) between the tube part (3) and the hub insertion part (4), A hub (9) is removably inserted into the hub insertion portion (4), and an injection needle (21) is attached to the side of the hub (9) facing away from the tubular portion (3). A hub side engaging means (15) is provided on a side of the hub (9) facing the tubular portion (3), and a piston body (25) is provided on the tubular portion (3). The piston side engaging means (31) is provided inside the piston body (25) so as to face the hub side engaging means (15) of the hub (9). Pairing means (15) The piston body (25) is provided with a closing means (33) made of an elastic material, and the closing means axially moves the inside of the cylindrical portion (3) in the directions of arrows A and B. And is provided slidably in the axial direction (directions of arrows A and B) together with the piston body (25) with respect to the tubular portion (3), and the closing means (33) is provided with the closing means. Locking portions (35d, 55) that can come into contact with the connecting portion (6) are formed by the movement of (33) in the axial direction (arrows A, B directions), and the pushing portion (35e) is provided in the closing means (33). ) To the locking portion (35
d, 55) and the contact portion (6) are in contact with each other, a gap space (5) is formed between the push-out portion (35e) and the contact portion (6).
1) is formed so that it can be formed. The second invention of the present invention is the piston (23) used in the syringe (1) of the first invention, wherein the piston (2) is
3) has a piston body (25), and a piston side engaging means (31) is provided at the tip end side of the piston body (25) so as to be insertably engaged with the hub side engaging means (15). , The piston body (25) can be closed by a closing means (33) formed of an elastic material in the inside of the cylindrical portion (3) in the axial direction (arrow A, B direction). Both of them are provided so as to be slidable in the axial direction (directions of arrows A and B) together with the piston body (25) with respect to the tubular portion (3), and the closing means (33) is provided with the closing means (3).
3) in the axial direction (arrows A and B) with respect to the tubular portion (3).
A locking part (35d, 55) that can come into contact with the connecting part (6) by a movement in the direction), and a push-out part (35e) is provided in the closing means (33) and the locking part (35d, 55). When the contact portion (6) and the contact portion (6) come into contact with each other, the pushing portion (35
e) and the communication part (6) are formed so that a gap space (51) can be formed. The numbers in parentheses () indicate the corresponding elements in the drawings for convenience, and therefore the present description is not limited to the description in the drawings. The same applies to the following action columns.
【０００５】[0005]
【作用】上記した構成により本発明のうち第一及び、第
二の発明では、注射終了位置（Ｐ２）から注射針収納動
作を開始することにより、閉塞手段（３３）は、ピスト
ン本体（２５）の押圧により、係止部（３５ｄ、５５）
付近において当接している連絡部（６）から反力を受け
て軸方向に圧縮され、しかも押出し部が隙間空間（５
１）を狭める形で即ち、連絡部（６）に向かって接近す
る形でハブ（９）側に押し出される。In the first and second aspects of the present invention having the above-mentioned structure, the closing means (33) causes the piston main body (25) to start the operation of retracting the injection needle from the injection end position (P2). By pressing, the locking parts (35d, 55)
A reaction force is received from the contact portion (6) that is abutting in the vicinity and compressed in the axial direction.
It is extruded toward the hub (9) in a form of narrowing 1), that is, in a form of approaching toward the connecting portion (6).
【０００６】[0006]
【実施例】図１は、本発明による注射器の一例のうちハ
ブ及びピストンの先端付近を示した断面図、図２は、図
１に示す注射器の全体を示す模式断面図、図３は、図２
に示す注射器のハブ挿着部付近の図、図４は、図２に示
す注射器のハブ挿着部を矢印Ｂ方向に見た図、図５は、
図２に示す注射器におけるピストンの折取り作業工程を
示した図、図６は、本発明による注射器の別の一例を示
した断面図である。DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a sectional view showing the vicinity of the hub and the tip of a piston in an example of the injector according to the present invention, FIG. 2 is a schematic sectional view showing the entire injector shown in FIG. 1, and FIG. Two
5 is a view of the vicinity of the hub insertion part of the syringe shown in FIG. 4, FIG. 4 is a view of the hub insertion part of the syringe shown in FIG.
FIG. 6 is a view showing a step of breaking off the piston in the syringe shown in FIG. 2, and FIG. 6 is a sectional view showing another example of the syringe according to the present invention.
【０００７】本発明による注射器１は、図２に示すよう
に、樹脂製のシリンジ１００を有しており、シリンジ１
００には、シリンジ本体２が設けられている（なお、図
２は注射器１の模式断面図であるが、便宜上、後述する
ピストン２３の一部においては、断面でなく側面を示し
てある。）。また、シリンジ本体２には、円筒状に形成
された主円筒部３が設けられている。ここで、主円筒部
３の軸心方向即ち、軸心Ｑ１に平行な正逆両方向を図の
矢印Ａ方向（即ち、図２の紙面左方向）及び、矢印Ｂ方
向（図２の紙面右方向）とする。主円筒部３の外周側に
は、該主円筒部３の矢印Ｂ側（図２の紙面右側）の開口
端部３ａ付近において、注射器支持部５が該主円筒部３
に対してツバ状に設けられており、主円筒部３の内周面
３ｃ側には、前記開口端部３ａ付近において、主円筒部
３の軸心Ｑ１に向かう方向即ち、図の矢印Ｄ方向に突起
した係止リブ３ｂが、該内周面３ｃに沿って円環状に形
成されている。主円筒部３の矢印Ａ側（図２の紙面左
側）には、内径が矢印Ａ方向に向かって所定の割合Ｋ１
で縮小した漏斗形状のテーパ部６が、該主円筒部３に一
体的に連続する形で形成されている。なお、主円筒部３
の内部と、テーパ部６の内部とは、矢印Ａ、Ｂ方向に連
通しており、これら両内部を合わせた空間をシリンジ本
体２の内部空間２ａとする。The syringe 1 according to the present invention has a resin syringe 100 as shown in FIG.
00 is provided with a syringe body 2 (note that FIG. 2 is a schematic cross-sectional view of the syringe 1, but for convenience, a part of a piston 23, which will be described later, shows a side surface rather than a cross-section). . Further, the syringe body 2 is provided with a main cylindrical portion 3 formed in a cylindrical shape. Here, the axial direction of the main cylindrical portion 3, that is, both the forward and reverse directions parallel to the axial center Q1, are the direction of arrow A in the figure (that is, the left direction on the paper surface of FIG. 2) and the direction of the arrow B (the right direction on the paper surface of FIG. 2). ). On the outer peripheral side of the main cylindrical portion 3, a syringe support portion 5 is provided near the opening end 3a of the main cylindrical portion 3 on the arrow B side (the right side in the drawing of FIG. 2).
Is provided in a brim shape on the inner peripheral surface 3c side of the main cylindrical portion 3, in the vicinity of the opening end 3a, toward the axis Q1 of the main cylindrical portion 3, that is, in the direction of arrow D in the figure. A locking rib 3b protruding in the shape of a ring is formed in an annular shape along the inner peripheral surface 3c. On the arrow A side of the main cylindrical portion 3 (on the left side of the paper surface of FIG. 2), the inner diameter has a predetermined ratio K1 toward the arrow A direction.
A funnel-shaped taper portion 6 reduced in size is formed so as to be integrally continuous with the main cylindrical portion 3. The main cylindrical portion 3
And the inside of the tapered portion 6 communicate with each other in the directions of arrows A and B, and the space obtained by combining these insides is defined as an internal space 2a of the syringe body 2.
【０００８】テーパ部６の矢印Ａ側即ち、シリンジ本体
２の先端側には、図１及び、図２に示すように、ハブ挿
着部４が、該テーパ部６に一体的に連続する形で形成さ
れており、ハブ挿着部４は小円筒部７を有している。小
円筒部７は前記テーパ部６に一体的に連続する形で形成
されていると共に、主円筒部３と同心状に形成されてお
り、小円筒部７の内径は、前記主円筒部３の内径よりも
小さく形成されている。小円筒部７の内周面７ａ側は、
ハブ挿着孔４ｂとなっており、ハブ挿着孔４ｂには、前
記軸心Ｑ１に向かって突起したハブ止リブ７ｄが形成さ
れている。ハブ止リブ７ｄは円環状に小円筒部７の内周
面７ａに沿って形成されており、ハブ止リブ７ｄの、前
記軸心Ｑ１を含む平面による断面（即ち、図１において
示される断面）は円弧状になっている。一方、小円筒部
７の外周面７ｆ側には、補強用リブ７ｃが、小円筒部７
を挾んでハブ止リブ７ｄと対応した位置に、円環状に設
けられている。また、小円筒部７には、図２乃至図４に
示すように、該小円筒部７の外径と等しい外径をもつ円
板状に形成された端壁８が設けられており、端壁８は、
該端壁８の矢印Ｂ側の壁面８ｂと、小円筒部７の矢印Ａ
側の端部７ｂとが互いに接する形で、小円筒部７と一体
的に設けられている。端壁８には、該端壁８の表裏両壁
面を矢印Ａ、Ｂ方向に貫通する形の円形断面の孔８ａ
が、前記軸心Ｑ１を中心にして設けられており、孔８ａ
の矢印Ａ側は、矢印Ａ方向に断面内径が拡大するテーパ
状に形成されている。更に、端壁８及び、小円筒部７に
亙って、図３及び、図４に示すように、３本のスリット
５０が形成されている。スリット５０は、端壁８におい
ては、軸心Ｑ１に対して放射方向即ち、図の矢印Ｃ、Ｄ
方向（但し、矢印Ｃ方向は矢印Ｄ方向の反対方向）に伸
延した形で、かつ端壁８に設けられた孔８ａに連絡され
た形で形成されており、小円筒部７においては、矢印
Ａ、Ｂ方向に平行な形で形成されている。なお、スリッ
ト５０は、前記ハブ止リブ７ｄ及び、前記補強用リブ７
ｃよりも矢印Ａ側の位置で、前記ハブ止リブ７ｄ及び、
前記補強用リブ７ｃに到達しない形で形成されている。
これらスリット５０によってハブ挿着部４の矢印Ａ側は
３つの部分に分割されているので、ハブ挿着部４はスリ
ット５０が形成された部分が矢印Ｃ方向に弾性的に拡大
しやすくなっている。つまり、シリンジ１００に後述の
ハブ９を挿着して注射器１を組立る際、ハブ挿着部４の
スリット５０が形成された部分を矢印Ｃ方向に弾性的に
拡大し、端壁８の孔８ａを拡大して、該孔８ａを介して
後述のハブ９をハブ挿着孔４ｂに挿入することが可能に
なっている。ハブ挿着部４は、以上のように構成されて
おり、シリンジ１００は、注射器支持部５及び、シリン
ジ本体２を構成する主円筒部３、テーパ部６、ハブ挿着
部４が一体成型される形で構成されている。On the arrow A side of the tapered portion 6, that is, on the distal end side of the syringe body 2, a hub insertion portion 4 is integrally formed with the tapered portion 6 as shown in FIGS. 1 and 2. The hub insertion portion 4 has a small cylindrical portion 7. The small cylindrical portion 7 is formed so as to be integrally continuous with the tapered portion 6 and is formed concentrically with the main cylindrical portion 3. The inner diameter of the small cylindrical portion 7 is the same as that of the main cylindrical portion 3. It is formed smaller than the inner diameter. The inner peripheral surface 7a side of the small cylindrical portion 7 is
The hub insertion hole 4b is formed, and the hub insertion hole 4b is formed with a hub stop rib 7d protruding toward the axis Q1. The hub stop rib 7d is formed in an annular shape along the inner peripheral surface 7a of the small cylindrical portion 7, and is a cross section of the hub stop rib 7d taken along a plane including the axis Q1 (that is, the cross section shown in FIG. 1). Has an arc shape. On the other hand, a reinforcing rib 7c is provided on the outer peripheral surface 7f side of the small cylinder portion 7
It is annularly provided at a position corresponding to the hub stop rib 7d. In addition, as shown in FIGS. 2 to 4, the small cylindrical portion 7 is provided with a disk-shaped end wall 8 having an outer diameter equal to the outer diameter of the small cylindrical portion 7. Wall 8
A wall surface 8b of the end wall 8 on the arrow B side and an arrow A of the small cylindrical portion 7
The side end portion 7b is in contact with each other and is integrally provided with the small cylindrical portion 7. The end wall 8 has a hole 8a having a circular cross section that penetrates both the front and back wall surfaces of the end wall 8 in the directions of arrows A and B.
Is provided around the axis Q1 and the hole 8a
The arrow A side of is formed in a taper shape whose cross-sectional inner diameter increases in the direction of arrow A. Further, three slits 50 are formed over the end wall 8 and the small cylindrical portion 7 as shown in FIGS. 3 and 4. In the end wall 8, the slit 50 is in the radial direction with respect to the axis Q1, that is, the arrows C and D in the figure.
Direction (however, the arrow C direction is the opposite direction of the arrow D direction) and is formed so as to communicate with the hole 8a provided in the end wall 8, and in the small cylindrical portion 7, the arrow It is formed in a shape parallel to the A and B directions. In addition, the slit 50 includes the hub stop rib 7d and the reinforcing rib 7
At a position on the arrow A side of c, the hub stop rib 7d and
It is formed so as not to reach the reinforcing rib 7c.
Since these slits 50 divide the hub insertion portion 4 on the arrow A side into three parts, the hub insertion portion 4 is likely to elastically expand in the arrow C direction at the portion where the slits 50 are formed. There is. That is, when assembling the syringe 1 by inserting the hub 9 described below into the syringe 100, the portion of the hub inserting portion 4 in which the slit 50 is formed is elastically expanded in the direction of the arrow C, and the hole of the end wall 8 is formed. It is possible to enlarge 8a and insert a hub 9 described later into the hub insertion hole 4b through the hole 8a. The hub insertion portion 4 is configured as described above, and in the syringe 100, the syringe support portion 5, the main cylindrical portion 3 forming the syringe body 2, the taper portion 6, and the hub insertion portion 4 are integrally molded. It is configured in a form.
【０００９】ハブ挿着部４のハブ挿着孔４ｂには、樹脂
製で、かつシリンジ１００よりも硬質のハブ９が設けら
れている。ハブ９は、図１乃至図３に示すように、ハブ
本体９０を有しており、ハブ本体９０には長手方向が前
記矢印Ａ、Ｂ方向に平行で、前記軸心Ｑ１を軸心とした
円柱状の主円柱部１０が設けられている。また、主円柱
部１０の外周面１０ｆ側にはハブ止溝１０ｃが形成され
ており、ハブ止溝１０ｃは、主円柱部１０の外周側に沿
って円環状に形成されている。主円柱部１０の矢印Ａ側
の端面１０ａ側には、矢印Ａ、Ｂ方向に伸延した形の小
円柱部１１が、該主円柱部１０と同心状で、かつ一体的
に設けられている。ハブ９は、該ハブ９の主円柱部１０
をハブ挿着部４のハブ挿着孔４ｂに挿入し、該ハブ９の
小円柱部１１を端壁８の孔８ａに貫通挿入させた形で設
けられている。また、ハブ挿着部４のハブ止リブ７ｄと
ハブ９のハブ止溝１０ｃとは、互いに対応整合した位置
に存在しており、従って、ハブ止リブ７ｄは、その矢印
Ｄ側の先端側を、該ハブ止リブ７ｄと整合対応した位置
に存在するハブ止溝１０ｃに挿入させる形でハブ止溝１
０ｃに係合している。なお、ハブ止リブ７ｄの矢印Ａ、
Ｂ方向の幅はハブ止溝１０ｃの矢印Ａ、Ｂ方向の幅より
も広いので、ハブ止リブ７ｄは、その先端の矢印Ａ側及
び、矢印Ｂ側のシール部７ｅ、７ｅにおいて、ハブ止溝
１０ｃの矢印Ａ、Ｂ両側の開口端部１０ｅ、１０ｅと当
接する形でハブ止溝１０ｃに係合している。なお、小円
筒部７の内周面７ａは、ハブ止リブ７ｄ以外では、ハブ
９の外周面１０ｆと接触しておらず、内周面７ａと外周
面１０ｆとの間には隙間空間４９が形成されている。つ
まり、ハブ挿着部４ｂの内周面７ａ側とハブ９との間の
接触は、ハブ止リブ７ｄとハブ９の外周面１０ｆ側との
間でのみ行われるので、シリンジ１００にハブ９を挿着
して注射器１を組立る際、ハブ挿着部４へのハブ９の挿
着が容易に行われ、また、後述する注射針収納動作の
際、ハブ挿着部４からハブ９を引き抜くことが容易に行
われる（但し、ハブ挿着部４へのハブ９の挿着及び、ハ
ブ挿着部４からのハブ９の引き抜きが容易に行われるな
らば、小円筒部７の内周面７ａのうちハブ止リブ７ｄ以
外の箇所とハブ９の外周面１０ｆとが接触していてもよ
い。）。また、ハブ９の主円柱部１０の矢印Ｂ側の端面
１０ｂは、ハブ挿着孔４ｂと前記内部空間２ａとの境界
（即ち、小円筒部７の内部とテーパ部６の内部との境
界）よりも矢印Ａ側に位置しており、ハブ挿入孔４ｂの
内部のうち該端面１０ｂより矢印Ｂ側の空間は孔内空間
４ａとなっている。一方、ハブ挿着部４は、そのハブ挿
入孔４ｂにハブ９が設けられた状態において、小円筒部
７が矢印Ｃ方向に膨張した形で弾性変形している。つま
り、小円筒部７の弾性変形による復元力が、小円筒部７
のハブ止リブ７ｄを介してハブ９に伝達されている。即
ち、ハブ止リブ７ｄとハブ９との間では、これら両者の
接触箇所であるシール部７ｅとハブ止溝１０ｃの開口端
部１０ｅとの間において、前記復元力による所定のシー
ル圧が互いに作用しあっており、これらシール部７ｅと
開口端部１０ｅとの間は水密或いは、気密状態になって
いる。なお、小円筒部７を挾んでハブ止リブ７ｄと対応
した位置に設けられている補強用リブ７ｃにより、小円
筒部７においては、ハブ止リブ７ｄ及び、ハブ止リブ７
ｄ付近の剛性が高められており、小円筒部７の弾性変形
による前記所定の復元力が効率よく得られるようになっ
ている。The hub insertion hole 4b of the hub insertion portion 4 is provided with a hub 9 made of resin and harder than the syringe 100. As shown in FIGS. 1 to 3, the hub 9 has a hub main body 90, and the longitudinal direction of the hub main body 90 is parallel to the directions of the arrows A and B, and the axis Q1 is set as the axis. A cylindrical main column portion 10 is provided. Further, a hub stop groove 10c is formed on the outer peripheral surface 10f side of the main cylindrical portion 10, and the hub stop groove 10c is formed in an annular shape along the outer peripheral side of the main cylindrical portion 10. On the side of the end surface 10a on the arrow A side of the main cylindrical portion 10, a small cylindrical portion 11 extending in the directions of arrows A and B is provided concentrically with the main cylindrical portion 10 and integrally with the main cylindrical portion 10. The hub 9 has a main cylindrical portion 10 of the hub 9.
Is inserted into the hub insertion hole 4b of the hub insertion portion 4, and the small cylindrical portion 11 of the hub 9 is inserted through the hole 8a of the end wall 8 to be provided. Further, the hub stop rib 7d of the hub insertion portion 4 and the hub stop groove 10c of the hub 9 are present at positions corresponding to each other, and therefore, the hub stop rib 7d has its tip end on the arrow D side. , The hub stop groove 1 is inserted into the hub stop groove 10c at a position corresponding to the hub stop rib 7d.
0c is engaged. The hub stop rib 7d has an arrow A,
Since the width in the B direction is wider than the widths of the hub stop groove 10c in the arrow A and B directions, the hub stop rib 7d has a hub stop groove at the tip end of the seal portions 7e, 7e on the arrow A side and the arrow B side. The hub stop groove 10c is engaged with the opening end portions 10e and 10e on both sides of arrows A and B of 10c. The inner peripheral surface 7a of the small cylindrical portion 7 is not in contact with the outer peripheral surface 10f of the hub 9 except for the hub stop rib 7d, and a gap space 49 is formed between the inner peripheral surface 7a and the outer peripheral surface 10f. Has been formed. That is, since the contact between the inner peripheral surface 7a side of the hub insertion portion 4b and the hub 9 is performed only between the hub stop rib 7d and the outer peripheral surface 10f side of the hub 9, the hub 9 is attached to the syringe 100. When inserting and assembling the syringe 1, the hub 9 can be easily inserted into the hub insertion portion 4, and the hub 9 is pulled out from the hub insertion portion 4 at the time of an injection needle storing operation described later. (However, if the insertion of the hub 9 into the hub insertion portion 4 and the withdrawal of the hub 9 from the hub insertion portion 4 are easily performed, the inner peripheral surface of the small cylindrical portion 7 A portion of 7a other than the hub stop rib 7d may be in contact with the outer peripheral surface 10f of the hub 9.). Further, the end surface 10b of the main cylindrical portion 10 of the hub 9 on the arrow B side is a boundary between the hub insertion hole 4b and the internal space 2a (that is, a boundary between the inside of the small cylindrical portion 7 and the inside of the tapered portion 6). Is located closer to the arrow A side than that, and a space inside the hub insertion hole 4b on the arrow B side from the end surface 10b is an inner space 4a. On the other hand, in the hub insertion portion 4, the small cylindrical portion 7 is elastically deformed in a state in which the small cylindrical portion 7 is expanded in the arrow C direction when the hub 9 is provided in the hub insertion hole 4b. That is, the restoring force due to the elastic deformation of the small cylindrical portion 7 is
Is transmitted to the hub 9 via the hub stop rib 7d. That is, between the hub stop rib 7d and the hub 9, a predetermined seal pressure due to the restoring force acts between the seal portion 7e, which is a contact point between the hub stop rib 7d and the hub 9, and the opening end portion 10e of the hub stop groove 10c. The seal 7e and the opening end 10e are watertight or airtight. In the small cylindrical portion 7, the hub stopping rib 7d and the hub stopping rib 7 are provided by the reinforcing rib 7c which is provided at a position corresponding to the hub stopping rib 7d by sandwiching the small cylindrical portion 7.
The rigidity in the vicinity of d is increased so that the predetermined restoring force due to elastic deformation of the small cylindrical portion 7 can be efficiently obtained.
【００１０】また、ハブ９には、図１乃至図３に示すよ
うに、針挿入孔１２が設けられており、針挿入孔１２
は、ハブ９のうち小円柱部１１の矢印Ａ側の端面１１ａ
に前記軸心Ｑ１を中心とした円形の開口部１２ａを形成
すると共に、該端面１１ａより矢印Ｂ方向に伸延する形
で設けられている。また、針挿入孔１２の矢印Ｂ側の端
部１２ｂは、前記主円柱部１０内部に達しており、該端
部１２ｂは、主円柱部１０による壁面１０ｄに接してい
る。なお、針挿入孔１２の途中には、針挿入孔１２の径
が矢印Ｂ方向に向かって収斂したテーパ部が適宜形成さ
れている。一方、ハブ９の主円柱部１０には、前記針挿
入孔１２の矢印Ｂ側（図１の紙面右側）に隣接する形
で、流通孔１３が設けられており、流通孔１３は、前記
軸心Ｑ１を中心とし、針挿入孔１２の端部１２ｂでの径
よりも径の小さな円柱状に設けられている。また、流通
孔１３は、主円柱部１０の前記壁面１０ｄに円形の開口
部を形成する形で、前記針挿入孔１２と連通して設けら
れている。更に、ハブ９の主円柱部１０には、前記流通
孔１３の矢印Ｂ側に連通隣接する形で、軸心Ｑ１に垂直
な断面が円形のピストン係合孔１５が軸心Ｑ１と同心状
に設けられており、ピストン係合孔１５の矢印Ｂ側は主
円柱部１０の端面１０ｂにおいて外部に開口している。
ピストン係合孔１５は、矢印Ａ側の係合保持部１６と矢
印Ｂ側の導入部１７との２つの部分からなっており、係
合保持部１６は軸心Ｑ１と同心状の略円柱形状で、その
矢印Ａ側及び、矢印Ｂ側の両端部側はそれぞれ径が矢印
Ａ方向及び、矢印Ｂ方向に向かって収斂するテーパ形状
になっている。また、係合保持部１６の矢印Ａ側の端部
側は、前記流通孔１３によって連通接続されている。係
合保持部１６の矢印Ｂ側の端部には、導入部１７が連通
隣接しており、導入部１７の径は矢印Ｂ方向に向かって
拡大している。よって、主円柱部１０のうち、係合保持
部１６に面した壁面１６ａと、導入部１７に面した壁面
１７ａとによって挾まれた部分は、係合保持部１６と導
入部１７との境界部１９を頂点とした形で軸心Ｑ１に向
かって突出した突出部２０を形成している。Further, the hub 9 is provided with a needle insertion hole 12 as shown in FIGS. 1 to 3, and the needle insertion hole 12 is formed.
Is an end surface 11a of the small column portion 11 of the hub 9 on the arrow A side.
Is formed with a circular opening 12a centered on the axis Q1 and extends in the direction of arrow B from the end surface 11a. Further, an end portion 12b of the needle insertion hole 12 on the arrow B side reaches the inside of the main cylindrical portion 10, and the end portion 12b is in contact with a wall surface 10d of the main cylindrical portion 10. In addition, in the middle of the needle insertion hole 12, a tapered portion in which the diameter of the needle insertion hole 12 converges in the arrow B direction is appropriately formed. On the other hand, the main cylindrical portion 10 of the hub 9 is provided with a circulation hole 13 adjacent to the arrow B side of the needle insertion hole 12 (on the right side in the drawing of FIG. 1). The needle insertion hole 12 is provided in a cylindrical shape having a diameter smaller than that of the end portion 12b of the needle insertion hole 12 with the center thereof at the center. Further, the circulation hole 13 is provided in communication with the needle insertion hole 12 in the form of forming a circular opening on the wall surface 10d of the main columnar portion 10. Further, in the main cylindrical portion 10 of the hub 9, a piston engagement hole 15 having a circular cross section perpendicular to the axis Q1 and concentric with the axis Q1 is formed so as to communicate with and adjoin the arrow B side of the flow hole 13. The piston engagement hole 15 is provided on the arrow B side and is open to the outside at the end surface 10b of the main columnar portion 10.
The piston engagement hole 15 is composed of two parts, an engagement holding portion 16 on the arrow A side and an introduction portion 17 on the arrow B side, and the engagement holding portion 16 is a substantially cylindrical shape concentric with the axis Q1. The diameters of both ends of the arrow A side and the arrow B side are tapered so as to converge in the arrow A direction and the arrow B direction, respectively. Further, the end portion side of the engagement holding portion 16 on the arrow A side is communicated and connected by the circulation hole 13. The introduction portion 17 is in communication with and adjoins the end portion of the engagement holding portion 16 on the arrow B side, and the diameter of the introduction portion 17 increases in the arrow B direction. Therefore, in the main columnar portion 10, a portion sandwiched by the wall surface 16 a facing the engagement holding portion 16 and the wall surface 17 a facing the introduction portion 17 is a boundary portion between the engagement holding portion 16 and the introduction portion 17. A projecting portion 20 projecting toward the axis Q1 is formed with 19 as the apex.
【００１１】一方、ハブ９の針挿入孔１２には、図２及
び図３に示すように、注射針２１が挿入されていおり、
注射針２１は、先端側がシリンジ本体２の外部側に位置
し、後端部側より針挿入孔１２に挿入されている。ま
た、注射針２１の後端は、針挿入孔１２の矢印Ｂ側に形
成された前記壁面１０ｄに当接しており、注射針２１の
先端から後端側に貫通されて設けられた媒体流通孔２１
ａと前記流通孔１３とは互いに矢印Ａ、Ｂ方向に連通隣
接している。また、針挿入孔１２には、注射針２１とハ
ブ９との間を充填する形で接着剤２２が注入され固結さ
れている。On the other hand, as shown in FIGS. 2 and 3, an injection needle 21 is inserted into the needle insertion hole 12 of the hub 9,
The tip of the injection needle 21 is located outside the syringe body 2, and the injection needle 21 is inserted into the needle insertion hole 12 from the rear end. Further, the rear end of the injection needle 21 is in contact with the wall surface 10d formed on the arrow B side of the needle insertion hole 12, and is a medium circulation hole penetrating from the tip of the injection needle 21 to the rear end side. 21
The "a" and the flow hole 13 communicate with and adjoin to each other in the directions of arrows A and B. Further, the adhesive 22 is injected into the needle insertion hole 12 so as to fill the space between the injection needle 21 and the hub 9 and is solidified.
【００１２】注射器１には、図１及び図２に示すよう
に、ピストン２３が設けられている（なお、図２は、注
射器１の模式断面図であるが、ピストン２３のうち、後
述するピストン本体２５、外押圧板２７、内押圧板２
９、パッキン支持部３０、ハブ係合部３１については、
便宜上、断面でなく側面を示している。）。ピストン２
３は、矢印Ａ、Ｂ方向に伸延した棒状のピストン本体２
５を有しており、ピストン本体２５は、矢印Ａ、Ｂ方向
に偏長な長方形板状の２つの合同な平板部２５ａが、断
面が十字状を成す形で一体的に交差して設けられてい
る。平板部２５ａの板面の矢印Ａ、Ｂ方向に垂直な幅
は、前記主円筒部３のうちの係止リブ３ｂにおける内径
に略等しく、ピストン本体２５は、該ピストン本体２５
の矢印Ａ側より、主円筒部３に、開口端部３ａを通して
挿入された形で設けられている。ピストン本体２５の各
平板部２５ａには、矢印Ａ側寄りにおいて、各平板部２
５ａの両側部よりピストン本体２５の軸心（即ち、軸心
Ｑ１）方向に楔形の切欠き２６が設けられている。４ヵ
所の切欠き２６は、矢印Ａ、Ｂ方向において互いに整合
した位置に設けられている。また、ピストン本体２５の
矢印Ｂ側の端部側には、板面が矢印Ａ、Ｂ方向に垂直な
円形板状の外押圧板２７がピストン本体２５と一体的に
設けられている。ピストン本体２５の矢印Ａ側の端部側
には、板面が矢印Ａ、Ｂ方向に垂直な円形板状の内押圧
板２９がピストン本体２５と一体的に、かつ同心状に設
けられており（従って、内押圧板２９は主円筒部３の内
部に位置しており）、内押圧板２９の径は、前記主円筒
部３の内径に略等しくなっている（従って、内押圧板２
９の径は、主円筒部３のうちの係止リブ３ｂにおける内
径よりも大きい。）。内押圧板２９には、図２に示すよ
うに、その矢印Ａ側にパッキン支持部３０が設けられて
おり、パッキン支持部３０には、矢印Ａ、Ｂ方向に伸延
した円柱状の円柱部３０ａが、内押圧板２９と同心状に
設けられている。円柱部３０ａの径は、内押圧板２９の
径よりも小さくなっており、円柱部３０ａは、内押圧板
２９の矢印Ａ側に、内押圧板２９と一体的に設けられて
いる。円柱部３０ａの矢印Ａ側には、図１及び、図２に
示すように、円柱部３０ａと同心状に矢印Ａ、Ｂ方向に
伸延し、かつ前記小円筒部７の内径に略等しい外径をも
つ円柱状の挿入円柱部３０ｂが、円柱部３０ａと一体的
に設けられている。更に、挿入円柱部３０ｂの矢印Ａ側
にはハブ係合部３１が設けられており、ハブ係合部３１
には、矢印Ａ、Ｂ方向に伸延した円柱状の円柱部３１ａ
が、挿入円柱部３０ｂと同心状に設けられている。円柱
部３１ａの径は、挿入円柱部３０ｂの径よりも小さくな
っており、円柱部３１ａは、挿入円柱部３０ｂの矢印Ａ
側に、挿入円柱部３０ｂと一体的に設けられている。円
柱部３１ａの矢印Ａ側には径が円柱部３１ａより大きな
半球状の挿入部３１ｂが、球面３１ｃ側を矢印Ａ側に向
ける形で円柱部３１ａと一体的に設けられており、挿入
部３１ｂにはその矢印Ａ側先端部から矢印Ｂ側に向かっ
て、球面３１ｃに沿った形の複数の筋状の溝３２が設け
られている。なお、円柱部３１ａの径は、前記ハブ９に
設けられたピストン係合孔１５の境界部１９における内
径に略等しくなっており、従って、挿入部３１ｂの径
は、境界部１９の径よりも大きくなっている。また、挿
入部３１ｂは、前記ピストン係合孔１５の係合保持部１
６に充分挿入保持され得る大きさになっている。As shown in FIGS. 1 and 2, the syringe 1 is provided with a piston 23 (note that FIG. 2 is a schematic cross-sectional view of the syringe 1; Main body 25, outer pressing plate 27, inner pressing plate 2
Regarding 9, the packing support portion 30, and the hub engagement portion 31,
For convenience, the side surface is shown instead of the cross section. ). Piston 2
3 is a rod-shaped piston body 2 extending in the directions of arrows A and B
5, the piston body 25 is provided with two congruent flat plate portions 25a in the shape of a rectangular plate, which are elongated in the directions of arrows A and B, integrally intersecting each other in a cross-shaped cross section. ing. The width of the plate surface of the flat plate portion 25a perpendicular to the directions of arrows A and B is substantially equal to the inner diameter of the locking rib 3b of the main cylindrical portion 3, and the piston body 25 is
It is provided so as to be inserted into the main cylindrical portion 3 through the opening end portion 3a from the arrow A side. Each flat plate portion 25a of the piston main body 25 is provided with a flat plate portion 2a near the arrow A side.
A wedge-shaped notch 26 is provided in the direction of the axis (that is, axis Q1) of the piston body 25 from both sides of 5a. The four notches 26 are provided at positions aligned with each other in the directions of arrows A and B. A circular plate-shaped outer pressing plate 27 having a plate surface perpendicular to the directions of arrows A and B is integrally provided with the piston body 25 on the end portion side of the piston body 25 on the arrow B side. A circular plate-shaped inner pressing plate 29 having a plate surface perpendicular to the directions of arrows A and B is provided integrally and concentrically with the piston body 25 on the end portion side of the piston body 25 on the arrow A side. (Thus, the inner pressing plate 29 is located inside the main cylindrical portion 3), and the diameter of the inner pressing plate 29 is substantially equal to the inner diameter of the main cylindrical portion 3 (thus, the inner pressing plate 2).
The diameter of 9 is larger than the inner diameter of the locking rib 3b of the main cylindrical portion 3. ). As shown in FIG. 2, the inner pressing plate 29 is provided with a packing support portion 30 on the arrow A side thereof, and the packing support portion 30 has a columnar columnar portion 30a extending in the directions A and B. Are provided concentrically with the inner pressing plate 29. The diameter of the columnar portion 30a is smaller than the diameter of the inner pressing plate 29, and the columnar portion 30a is provided integrally with the inner pressing plate 29 on the arrow A side of the inner pressing plate 29. On the arrow A side of the columnar portion 30a, as shown in FIGS. 1 and 2, an outer diameter that extends concentrically with the columnar portion 30a in the directions of arrows A and B and that is substantially equal to the inner diameter of the small cylindrical portion 7 is provided. A columnar insertion columnar portion 30b having a is formed integrally with the columnar portion 30a. Further, a hub engaging portion 31 is provided on the insertion column portion 30b on the arrow A side.
Is a columnar cylindrical portion 31a extending in the directions of arrows A and B.
Are provided concentrically with the insertion column portion 30b. The diameter of the cylindrical portion 31a is smaller than the diameter of the inserted cylindrical portion 30b, and the cylindrical portion 31a is indicated by the arrow A of the inserted cylindrical portion 30b.
It is provided integrally with the insertion column portion 30b on the side. On the arrow A side of the columnar portion 31a, a hemispherical insertion portion 31b having a diameter larger than that of the columnar portion 31a is integrally provided with the columnar portion 31a so that the spherical surface 31c side faces the arrow A side. Is provided with a plurality of streak-shaped grooves 32 along the spherical surface 31c from the arrow A side tip portion toward the arrow B side. The diameter of the cylindrical portion 31a is substantially equal to the inner diameter of the boundary 19 of the piston engagement hole 15 provided in the hub 9, and therefore the diameter of the insertion portion 31b is larger than the diameter of the boundary 19. It is getting bigger. Further, the insertion portion 31b is the engagement holding portion 1 of the piston engagement hole 15.
The size is such that it can be fully inserted and held in the 6.
【００１３】一方、パッキン支持部３０には、図１に示
すように、可撓性のある樹脂からなるパッキン３３が支
持されて設けられている。パッキン３３は、シリンジ１
００の主円筒部３の内部に整合して挿入されたパッキン
本体３５を有しており、パッキン本体３５には、該パッ
キン本体３５を矢印Ａ、Ｂ方向に貫通する形の係合孔３
５ａが設けられている。また、係合孔３５ａには、パッ
キン支持部３０の円柱部３０ａ及び、挿入円柱部３０ｂ
の一部が貫通した状態になっている。つまり、パッキン
３３は、係合孔３５ａにパッキン支持部３０を貫通させ
る形で該パッキン支持部３０と係合しており、係合によ
って該パッキン支持部３０に支持されて設けられてい
る。また、パッキン本体３５の矢印Ｂ側の端部は、内押
圧板２９により矢印Ａ方向の力を受けやすいように、該
内押圧板２９に当接している。また、パッキン本体３５
の矢印Ａ側はテーパ部３５ｂとなっている。前記シリン
ジ本体２のテーパ部６の内部の形状が、上述したように
その内径が矢印Ａ方向に向かって所定の割合Ｋ１で縮小
するテーパ形状であるのに対し、テーパ部３５ｂの自然
状態における形状は、その外径が所定の割合Ｋ１よりも
大きな所定の割合Ｋ２で縮小するテーパ形状である。即
ち、テーパ部３５ｂは、自然状態のテーパ部３５ｂがテ
ーパ部６の内部に該テーパ部３５ｂの矢印Ｂ側の端部３
５ｄがテーパ部６の内周面６ａに当接した際に、該テー
パ部３５ｂの端部３５ｄ以外の表面３５ｅとテーパ部６
の内周面６ａとの間に余裕空間５１が形成される形で形
成されている。なお、係合孔３５ａを貫通した状態のパ
ッキン支持部３０の挿入円柱部３０ｂの矢印Ａ側の一部
分はテーパ部３５ｂよりも更に矢印Ａ側に突出してい
る。なお、パッキン３３のテーパ部３５ｂが自然状態に
おいて、該テーパ部３５ｂの端部３５ｄを前記シリンジ
本体２のテーパ部６の内部に当接させた状態では、図１
に示すように、該パッキン３３を係合しているパッキン
支持部３０の挿入円柱部３０ｂがシリンジ本体２のハブ
挿入孔４ｂに挿入した状態になり、ハブ係合部３１の挿
入部３１ｂの球面３１ｃが、前記ピストン係合孔１５の
導入部１７に面した壁面１７ａに接した状態になるよう
に、パッキン３３の形状が設定されている。また、パッ
キン３３のパッキン本体３５の外径は、前記内押圧板２
９と略同径になっているが、パッキン本体３５の外周側
には、該パッキン本体３５の外周に沿った形の円環状の
ヒダ３５ｃが、矢印Ａ、Ｂ方向に並んで二重に形成され
ている。従って、パッキン３３は、パッキン本体３５の
うちヒダ３５ｃ付近が軸心Ｑ１に向かう方向即ち、矢印
Ｄ方向に弾性変形による縮小をする形でシリンジ本体２
の主円筒部３に挿入されている。つまり、パッキン３３
と主円筒部３７とは、ヒダ３５ｃと内周面３ｃとにおい
て密着した状態になっており、パッキン３３と主円筒部
３との間は水封気封にシールされている。また、シリン
ジ本体２の主円筒部３の内周面３ｃは滑らかに形成され
ており、従って、パッキン３３が挿着されたピストン２
３は、主円筒部３の内部空間２ａにおいて矢印Ａ、Ｂ方
向に摺動移動自在になっている。On the other hand, as shown in FIG. 1, a packing 33 made of a flexible resin is supported and provided on the packing supporting portion 30. The packing 33 is a syringe 1
00 has a packing main body 35 that is aligned and inserted into the main cylindrical portion 3 of 00, and the packing main body 35 has an engagement hole 3 that penetrates the packing main body 35 in the directions of arrows A and B.
5a is provided. Further, in the engagement hole 35a, the columnar portion 30a of the packing support portion 30 and the insertion columnar portion 30b.
Is partially penetrated. That is, the packing 33 is engaged with the packing support portion 30 in a manner of penetrating the packing support portion 30 into the engagement hole 35a, and is provided by being supported by the packing support portion 30 by the engagement. The end portion of the packing body 35 on the arrow B side is in contact with the inner pressing plate 29 so that the inner pressing plate 29 can easily receive the force in the arrow A direction. In addition, the packing body 35
The arrow A side of is a tapered portion 35b. The inner shape of the tapered portion 6 of the syringe body 2 is a tapered shape whose inner diameter is reduced in the direction of arrow A at a predetermined rate K1 as described above, whereas the tapered portion 35b is in a natural state. Is a tapered shape whose outer diameter is reduced by a predetermined rate K2 which is larger than the predetermined rate K1. That is, in the tapered portion 35b, the tapered portion 35b in the natural state is provided inside the tapered portion 6 and the end portion 3 on the arrow B side of the tapered portion 35b.
When 5d comes into contact with the inner peripheral surface 6a of the taper portion 6, the surface 35e other than the end portion 35d of the taper portion 35b and the taper portion 6 are formed.
Is formed in such a manner that a margin space 51 is formed between the inner peripheral surface 6a and the inner peripheral surface 6a. A part of the insertion columnar portion 30b of the packing support portion 30 in the state of penetrating the engagement hole 35a on the arrow A side further projects toward the arrow A side than the tapered portion 35b. It should be noted that when the tapered portion 35b of the packing 33 is in a natural state and the end portion 35d of the tapered portion 35b is brought into contact with the inside of the tapered portion 6 of the syringe main body 2, FIG.
As shown in FIG. 3, the insertion columnar portion 30b of the packing support portion 30 engaging with the packing 33 is in a state of being inserted into the hub insertion hole 4b of the syringe body 2, and the spherical surface of the insertion portion 31b of the hub engagement portion 31. The shape of the packing 33 is set so that 31c is in contact with the wall surface 17a of the piston engagement hole 15 that faces the introduction portion 17. The outer diameter of the packing main body 35 of the packing 33 is equal to the inner pressing plate 2
Although the diameter is substantially the same as 9, the annular folds 35c are formed on the outer peripheral side of the packing main body 35 along the outer periphery of the packing main body 35 so as to be lined up in the directions of arrows A and B and doubly. Has been done. Therefore, the packing 33 is configured such that the vicinity of the fold 35c of the packing body 35 is elastically deformed in the direction toward the axial center Q1, that is, in the direction of the arrow D, so that the syringe body 2 is compressed.
Is inserted into the main cylindrical portion 3 of the. That is, the packing 33
The main cylindrical portion 37 and the main cylindrical portion 37 are in close contact with each other at the folds 35c and the inner peripheral surface 3c, and the packing 33 and the main cylindrical portion 3 are sealed with a water seal. Further, the inner peripheral surface 3c of the main cylindrical portion 3 of the syringe body 2 is formed smoothly, so that the piston 2 having the packing 33 inserted therein is attached.
3 is slidably movable in the internal space 2a of the main cylindrical portion 3 in the directions of arrows A and B.
【００１４】注射器１は、以上のように構成されてお
り、該注射器１を使用し、使用の後、廃棄するには次の
ように行う。まず、注射器１の注射針２１を、図示しな
い薬ビンに入っている注射媒体５２の中に進入させ、ピ
ストン２３をシリンジ本体２に対して矢印Ｂ方向に引っ
張り、差圧により、該薬ビンの中の注射媒体５２を、注
射針２１の媒体流通孔２１ａ及び、ハブ９の流通孔１
３、ピストン係合孔１５を通して、ハブ挿着部４の孔内
空間４ａ及びシリンジ本体２の内部空間２ａのうちピス
トン２３よりも注射針２１側の、媒体保持空間５３に流
入させて、注射器１に注射媒体５２を充填する。なお、
注射媒体５２の充填の際、ハブ９には外部と媒体保持空
間５３との間の差圧により矢印Ｂ方向の差圧力が作用す
るが、ハブ挿着部４のもつ矢印Ｄ方向の復元力が、上述
したように所定の大きさに設定されていることより、予
想される最大の差圧力に対してもハブ９とハブ挿着部４
との間では矢印Ａ側及び、矢印Ｂ側の各シール部７ｅと
各開口端部１０ｅの間のシールが外れない。The syringe 1 is constructed as described above, and the syringe 1 is used and discarded after use as follows. First, the injection needle 21 of the syringe 1 is advanced into the injection medium 52 contained in a drug bottle (not shown), the piston 23 is pulled in the direction of arrow B with respect to the syringe body 2, and the pressure difference causes The injection medium 52 inside the medium circulation hole 21a of the injection needle 21 and the circulation hole 1 of the hub 9
3, through the piston engagement hole 15, into the medium holding space 53 on the injection needle 21 side of the piston 23 in the hole inner space 4a of the hub insertion portion 4 and the inner space 2a of the syringe body 2, the syringe 1 Is filled with injection medium 52. In addition,
When the injection medium 52 is filled, a differential pressure in the arrow B direction acts on the hub 9 due to the differential pressure between the outside and the medium holding space 53, but the restoring force of the hub insertion portion 4 in the arrow D direction is exerted. Since the size is set to the predetermined value as described above, the hub 9 and the hub insertion portion 4 are set even for the maximum expected differential pressure.
The seals between the seal portions 7e on the arrow A side and the seal portions 7e on the arrow B side and the open end portions 10e do not come apart.
【００１５】注射媒体５２の充填の後、注射器１の注射
針２１を、患者の注射部位に突き差す。次いで、ピスト
ン２３の外押圧板２７を矢印Ａ方向に押し、ピストン２
３をシリンジ本体２に対して矢印Ａ方向に駆動させる。
媒体保持空間５３の注射媒体５２は加圧されて、ハブ９
のピストン係合孔１５及び、流通孔１３及び、注射針２
１の媒体流通孔２１ａを介して患者の注射部位における
体内に流入する。なお、注射媒体５２が加圧され、注射
媒体５２に隣接しているハブ９の端面１０ｂ側より、該
ハブ９には注射媒体５２の圧力による作用力が矢印Ａ方
向に加わるが、ハブ挿着部４のもつ矢印Ｄ方向の復元力
が、上述したように所定の大きさに設定されていること
より、予想される最大の作用力に対してもハブ９とハブ
挿着部４との間では矢印Ａ側及び、矢印Ｂ側の各シール
部７ｅと各開口端部１０ｅの間のシールが外れない。注
射媒体５２を所定の量まで患者の注射部位における体内
に流入させた後、従って、パッキン３３のテーパ部３５
ｂの端部３５ｄが、シリンジ本体２のテーパ部６の内部
に当接し、ピストン２３のハブ係合部３１の挿入部３１
ｂが、図１に示すように、ハブ９のピストン係合孔１５
の導入孔１７における壁面１７ａに当接する位置即ち、
図の注射終了位置Ｐ２までピストン２３を駆動させた
後、注射器１を全体を患者に対して矢印Ｂ方向に引っ張
り、注射針２１を患者の注射部位から引き抜く。After filling the injection medium 52, the injection needle 21 of the syringe 1 is pierced at the injection site of the patient. Next, the outer pressing plate 27 of the piston 23 is pushed in the direction of arrow A, and the piston 2
3 is driven in the direction of arrow A with respect to the syringe body 2.
The injection medium 52 in the medium holding space 53 is pressurized and the hub 9
Piston engagement hole 15, communication hole 13, and injection needle 2
It flows into the body at the injection site of the patient through the first medium circulation hole 21a. It should be noted that the injection medium 52 is pressurized, and the action force due to the pressure of the injection medium 52 is applied to the hub 9 from the end face 10b side of the hub 9 adjacent to the injection medium 52 in the direction of arrow A, but Since the restoring force of the portion 4 in the direction of the arrow D is set to a predetermined magnitude as described above, the portion between the hub 9 and the hub insertion portion 4 is set to the maximum expected acting force. Then, the seal between the seal portions 7e on the arrow A side and the arrow B side and the open end portions 10e cannot be removed. After injecting the injection medium 52 up to a predetermined amount into the body of the patient at the injection site, the taper portion 35 of the packing 33 is thus removed.
The end portion 35d of b abuts on the inside of the tapered portion 6 of the syringe body 2, and the insertion portion 31 of the hub engaging portion 31 of the piston 23
b is the piston engagement hole 15 of the hub 9 as shown in FIG.
Of the introduction hole 17 in contact with the wall surface 17a, that is,
After driving the piston 23 to the injection end position P2 in the figure, the entire syringe 1 is pulled in the direction of arrow B with respect to the patient, and the injection needle 21 is pulled out from the injection site of the patient.
【００１６】注射針２１を引き抜いた後、注射針収納動
作を以下のように行う。注射針収納動作は、まずピスト
ン２３とハブ９との係合動作を以下のように行う。即
ち、ピストン２３の外押圧板２７を指で、更に矢印Ａ方
向に押圧して、ピストン本体２５を矢印Ａ方向に押圧
し、パッキン支持部３０の挿入円柱部３０ｂ及び、ハブ
係合部３１を、ハブ挿着孔４ｂ中において矢印Ａ方向に
送り出す。ところで、注射針収納動作を開始する直前に
は、ピストン２３は、自然状態のテーパ部３５ｂがテー
パ部６の内部に対応して位置する形で位置しており、該
テーパ部３５ｂの矢印Ｂ側の端部３５ｄはテーパ部６の
内周面６ａに当接し、該テーパ部３５ｂの端部３５ｄ以
外の表面３５ｅとテーパ部６の内周面６ａとの間には余
裕空間５１が形成されている。従って、ピストン本体２
５の矢印Ａ方向の押圧によって、パッキン３３において
は、テーパ部６に当接している端部３５ｄ付近から、矢
印Ｂ側の部分が矢印Ａ、Ｂ方向に圧縮されると共に、そ
の他の部分は、表面３５ｅがテーパ部６に接近する形で
余裕空間５１を利用して、矢印Ａ方向に押し出される。
従って、余裕空間５１によって、パッキン３３における
弾性圧縮の量は該余裕空間５１の分だけ軽減されるの
で、極力小さな力でピストン２３の操作が可能となる。
また、注射針収納動作を開始する直前においては、図１
に示すように、ハブ９の端面１０ｂとピストン２３側の
挿入円柱部３０ｂとの間に存在する孔内空間４ａ（即
ち、媒体保持空間５３）及び、前記余裕空間５１（即
ち、媒体保持空間５３）には、残留した注射媒体５２で
充満されている。また、注射針収納動作を開始して上述
したようにピストン２３を矢印Ａ方に押圧移動させるこ
とによって、残留した注射媒体５２は加圧される。しか
し、挿入部３１ｂには上述したように複数の溝３２が設
けられており、挿入部３１ｂと壁面１７ａとが押圧当接
した際にも、これら溝３２は閉塞されないようになって
いる。従って、挿入部３１ｂと壁面１７ａとが押圧当接
した際にも、孔内空間４ａ或いは、余裕空間５１側と係
合保持部１６側とはこれら溝３２を連通しており、孔内
空間４ａ或いは、余裕空間５１の加圧された残留した注
射媒体５２は、これら溝３２を介して係合保持部１６側
に流動し（なぜなら、挿入円柱部３０ｂと小円筒部７と
の間は水密ではないので、余裕空間５１の注射媒体５２
はこれら挿入円柱部３０ｂと小円筒部７との間を通って
孔内空間４ａ側に流動し得る）、更に、流通孔１３、注
射針２１の媒体流通孔２１ａを介して外部に排出され
る。つまり、注射針収納動作を開始してピストン２３を
矢印Ａ方に押圧移動させるた際にも、孔内空間４ａ或い
は、余裕空間５１で加圧される残留した注射媒体５２は
適宜外部に排出されて、その圧力を極力上昇させること
がないので、ピストン２３には残留した注射媒体５２の
圧力による抵抗が極力かからず、ピストン２３は極力小
さな力で矢印Ａ方に押圧移動される。更に、パッキン３
３を弾性縮小させながら、パッキン支持部３０の挿入円
柱部３０ｂ及び、ハブ係合部３１を、ハブ挿着孔４ｂ中
において矢印Ａ方向に押圧移動させ、ハブ係合部３１の
挿入部３１ｂをピストン係合孔１５の導入部１７から係
合保持部１６に向かって矢印Ａ方向に押圧移動させる。
つまり、ピストン２３を矢印Ａ方向に押圧移動させるこ
とによって、挿入部３１ｂは、導入部１７における壁面
１７ａに押圧される。しかし、挿入部３１ｂの矢印Ａ側
は球面３１ｃとなっており、従って、挿入部３１ｂは軸
心Ｐ１に垂直な断面が矢印Ａ方向に向かって縮小する形
に形成されており、挿入部３１ｂはこの球面３１ｃにお
いて壁面１７ａに押圧される。また、導入部１７も、そ
の内部が矢印Ａ方向に向かって縮小するテーパ状に形成
されている。従って、挿入部３１ｂを導入部１７におい
て矢印Ａ方向に押圧させることにより、挿入部３１ｂと
壁面１７ａを形成する突出部２０との両者間においてそ
れぞれ作用している押圧による応力が、挿入部３１ｂに
対してはその軸心Ｐ１に垂直な断面積を弾性的に縮小さ
せる形で、突出部２０に対しては導入部１７の内部を矢
印Ｃ方向に弾性的に拡大させる形で、それぞれ効果的に
作用する。結局、挿入部３１ｂの軸心Ｐ１に垂直な断面
積が縮小され、導入部１７の内部が矢印Ｃ方向に拡大さ
れることによって、矢印Ａ方向に押圧されている挿入部
３１ｂは導入部１７において矢印Ａ方向に移動する。更
に、ピストン２３を矢印Ａ方に押圧し、該挿入部３１ｂ
を導入部１７において矢印Ａ方向に更に移動させ、従っ
て、挿入部３１ｂをその矢印Ａ側より、導入部１７と係
合保持部１６との境界部１９を通過させる形で該係合保
持部１６側に移動させて、挿入部３１ｂを完全に該係合
保持部１６に挿入させることにより、ピストン２３の押
圧を停止する。挿入部３１ｂが完全に係合保持部１６に
挿入されることにより、ハブ係合部３１とピストン係合
孔１５とは互いに係合され、ピストン２３とハブ９との
係合動作が完了する。なお、挿入部３１ｂに矢印Ａ方向
の押圧力が作用することによって、ハブ９にも矢印Ａ方
向の押圧力が作用する。しかし、ハブ９は、ハブ挿着部
４のハブ止リブ７ｄ或いは、端壁８を介して、シリンジ
本体２を支持する手により矢印Ｂ方向に支持され、或い
は、支持され得る。従って、ハブ９は、該押圧力を受け
ても矢印Ａ方向等に殆ど移動せず、ハブ９が端壁８の孔
８ａから矢印Ａ方向に抜け出ることはない。After pulling out the injection needle 21, the injection needle storing operation is performed as follows. In the injection needle storing operation, first, the engaging operation between the piston 23 and the hub 9 is performed as follows. That is, the outer pressing plate 27 of the piston 23 is further pressed with a finger in the direction of arrow A to press the piston body 25 in the direction of arrow A, and the insertion columnar portion 30b of the packing support portion 30 and the hub engaging portion 31 are pushed. , In the direction of arrow A in the hub insertion hole 4b. Immediately before starting the needle accommodating operation, the piston 23 is positioned such that the tapered portion 35b in the natural state is located inside the tapered portion 6, and the tapered portion 35b is located on the arrow B side. End portion 35d abuts on the inner peripheral surface 6a of the tapered portion 6, and a margin space 51 is formed between the surface 35e other than the end portion 35d of the tapered portion 35b and the inner peripheral surface 6a of the tapered portion 6. There is. Therefore, the piston body 2
By pressing 5 in the direction of the arrow A, in the packing 33, the portion on the arrow B side is compressed in the directions of the arrows A and B from the vicinity of the end portion 35d in contact with the tapered portion 6, and the other portions are The front surface 35e is pushed out in the direction of the arrow A using the spare space 51 so that the front surface 35e approaches the tapered portion 6.
Therefore, since the amount of elastic compression in the packing 33 is reduced by the extra space 51 by the amount of the extra space 51, the piston 23 can be operated with a force as small as possible.
Immediately before starting the needle accommodating operation,
As shown in FIG. 5, the hole inner space 4a (that is, the medium holding space 53) existing between the end surface 10b of the hub 9 and the insertion cylindrical portion 30b on the piston 23 side, and the margin space 51 (that is, the medium holding space 53). ) Is filled with residual injection medium 52. The remaining injection medium 52 is pressurized by starting the operation of accommodating the injection needle and pressing and moving the piston 23 in the direction of arrow A as described above. However, the insertion portion 31b is provided with the plurality of grooves 32 as described above, and the grooves 32 are not blocked even when the insertion portion 31b and the wall surface 17a are pressed and brought into contact with each other. Therefore, even when the insertion portion 31b and the wall surface 17a are pressed and brought into contact with each other, the groove space 32a is communicated with the space 4a in the hole or between the spare space 51 side and the engagement holding part 16 side. Alternatively, the pressurized residual injection medium 52 in the extra space 51 flows toward the engagement holding portion 16 side through these grooves 32 (because the insertion cylindrical portion 30b and the small cylindrical portion 7 are not watertight. Since there is no injection medium 52 in the extra space 51
Can flow to the space 4a in the hole through the space between the insertion column 30b and the small cylinder 7), and is further discharged to the outside via the flow hole 13 and the medium flow hole 21a of the injection needle 21. . That is, even when the injection needle storing operation is started and the piston 23 is pressed and moved in the direction of arrow A, the residual injection medium 52 pressurized in the hole space 4a or the margin space 51 is appropriately discharged to the outside. Since the pressure is not increased as much as possible, the resistance due to the residual pressure of the injection medium 52 is not applied to the piston 23 as much as possible, and the piston 23 is pressed and moved in the direction of arrow A with the smallest possible force. In addition, packing 3
While elastically shrinking 3, the insertion columnar portion 30b of the packing support portion 30 and the hub engaging portion 31 are pressed and moved in the direction of arrow A in the hub insertion hole 4b, and the insertion portion 31b of the hub engaging portion 31 is moved. The piston engagement hole 15 is pushed and moved in the direction of arrow A from the introduction portion 17 toward the engagement holding portion 16.
That is, by pushing and moving the piston 23 in the direction of arrow A, the insertion portion 31 b is pushed by the wall surface 17 a of the introduction portion 17. However, the insertion portion 31b has a spherical surface 31c on the arrow A side. Therefore, the insertion portion 31b is formed such that the cross section perpendicular to the axis P1 shrinks in the direction of the arrow A, and the insertion portion 31b is The spherical surface 31c is pressed against the wall surface 17a. Further, the introduction portion 17 is also formed in a tapered shape in which the inside thereof is reduced in the direction of arrow A. Therefore, by pressing the insertion portion 31b in the direction of the arrow A in the introduction portion 17, the stress due to the pressure acting between the insertion portion 31b and the protruding portion 20 forming the wall surface 17a is applied to the insertion portion 31b. On the other hand, by effectively reducing the cross-sectional area perpendicular to the axis P1 and elastically enlarging the inside of the introducing portion 17 in the direction of arrow C with respect to the protruding portion 20, each effectively. To work. Eventually, the cross-sectional area perpendicular to the axis P1 of the insertion portion 31b is reduced, and the inside of the introduction portion 17 is expanded in the direction of arrow C, so that the insertion portion 31b pressed in the direction of arrow A is inserted in the introduction portion 17. Move in the direction of arrow A. Further, the piston 23 is pushed in the direction of arrow A, and the insertion portion 31b
Is further moved in the direction of the arrow A in the introduction portion 17, and therefore, the insertion holding portion 31b is passed from the arrow A side through the boundary portion 19 between the introduction portion 17 and the engagement holding portion 16 so as to pass through the engagement holding portion 16b. By pushing the piston 23 to the side and completely inserting the insertion portion 31b into the engagement holding portion 16, the pressing of the piston 23 is stopped. When the insertion portion 31b is completely inserted into the engagement holding portion 16, the hub engagement portion 31 and the piston engagement hole 15 are engaged with each other, and the engagement operation between the piston 23 and the hub 9 is completed. Note that the pressing force in the arrow A direction acts on the insertion portion 31b, so that the pressing force in the arrow A direction also acts on the hub 9. However, the hub 9 can be or can be supported in the direction of arrow B by the hand that supports the syringe body 2 via the hub stop rib 7d of the hub insertion portion 4 or the end wall 8. Therefore, the hub 9 hardly moves in the arrow A direction or the like even when receiving the pressing force, and the hub 9 does not come out of the hole 8a of the end wall 8 in the arrow A direction.
【００１７】次いで、ピストン２３をシリンジ本体２に
対して矢印Ｂ方向に所定の引き抜き力で引く。つまり、
ピストン２３及び、ハブ係合部３１の挿入部３１ｂには
所定の引き抜き力による矢印Ｂ方向の作用力が作用す
る。ところで、ハブ挿着部４のもつ矢印Ｄ方向の復元力
は、上述したように所定の大きさに設定されていること
より、所定の引き抜き力による矢印Ｂ方向の作用力に対
しては、ハブ９とハブ挿着部４との間での矢印Ａ側及
び、矢印Ｂ側の各シール部７ｅと各開口端部１０ｅの間
のシールが外れ、従って、ハブ止リブ７ｄとハブ止溝１
０ｃとの係合が外れる。ハブ止リブ７ｄとハブ止溝１０
ｃとの係合を外すと共に、ハブ９を更に矢印Ｂ方向に進
めて、ハブ９が完全にハブ挿着孔４ｂから矢印Ｂ方向に
抜け出るまで引っ張る。この際、ハブ９とハブ挿着孔４
ｂとの間には隙間空間４９が形成されているので、ハブ
９と小円筒部７の接触はハブ止リブ７ｄ部分を介しての
み行われることとなり、その引き抜き動作は、ハブ止リ
ブ７ｄとハブ止溝１０ｃとの係合が外れた以降は、小さ
な力で容易に行うことができる。Next, the piston 23 is pulled with respect to the syringe body 2 in the direction of arrow B with a predetermined pulling force. That is,
An acting force in the arrow B direction due to a predetermined pulling force acts on the piston 23 and the insertion portion 31b of the hub engaging portion 31. By the way, the restoring force of the hub insertion portion 4 in the direction of arrow D is set to a predetermined magnitude as described above, and therefore, the action force in the direction of arrow B due to the predetermined pulling-out force is set to the hub. 9 and the hub insertion portion 4, the seals between the seal portions 7e on the arrow A side and the open end portions 10e on the arrow B side are released, and therefore, the hub stop rib 7d and the hub stop groove 1 are removed.
0c is disengaged. Hub stop rib 7d and hub stop groove 10
At the same time as releasing the engagement with c, the hub 9 is further advanced in the direction of arrow B, and is pulled until the hub 9 completely comes out of the hub insertion hole 4b in the direction of arrow B. At this time, the hub 9 and the hub insertion hole 4
Since the clearance space 49 is formed between the hub 9 and the hub b, the hub 9 and the small cylindrical portion 7 are brought into contact with each other only via the hub stop rib 7d. After the engagement with the hub stop groove 10c is released, it can be easily performed with a small force.
【００１８】更にピストン２３を引っ張り、ハブ９の矢
印Ａ側に固定挿入された注射針２１が端壁８の孔８ａよ
りハブ挿着孔４ｂに矢印Ｂ方向に挿入され、更に矢印Ｂ
方向に主円筒部３の内部空間２ａに挿入されて、注射針
２１の先端が完全に内部空間２ａ内に挿入される形で、
ピストン２３を矢印Ｂ方向に引っ張る。ピストン２３を
更に引っ張り、図５に示すように、内押圧板２９が、シ
リンジ本体２の主円筒部３の係止リブ３ｂに当接する位
置まで引っ張ってピストン２３を停止させる。すると、
ピストン本体２５の切欠き２６がシリンジ本体２の開口
端部３ａ付近に位置決めされる。次いで、ピストン２３
に矢印Ｃ方向の力を与える。シリンジ本体２に対して、
ピストン２３に矢印Ｃ方向の力が加えられることによ
り、ピストン本体２５において比較的曲げ応力に対して
構造上弱く形成されている切欠き２６においてピストン
本体２５は折れ、ピストン本体２５は、切欠き２６を境
に矢印Ａ側の部分と矢印Ｂ側の部分とに分離される。次
いで、これらの折取りされたシリンジ本体２側の部分と
ピストン２３の外押圧板２７の部分とを廃棄処分する。
なお、注射針２１は、完全にシリンジ本体２の内部空間
２ａに、残留したピストン２３先端部に保持された状態
で挿入格納されているため、該注射針２１によって、手
等を傷つけ、その傷口より二次感染する恐れはなく、従
って、廃棄処分が安全に行われる。以上のように、注射
針収納動作が完了し、注射器１の使用及び、使用後の廃
棄処分を全て終了する。Further, the piston 23 is pulled, and the injection needle 21 fixedly inserted on the arrow A side of the hub 9 is inserted from the hole 8a of the end wall 8 into the hub insertion hole 4b in the direction of arrow B, and further arrow B.
Is inserted into the inner space 2a of the main cylindrical portion 3 in the direction, and the tip of the injection needle 21 is completely inserted into the inner space 2a.
Pull the piston 23 in the direction of arrow B. The piston 23 is further pulled, and as shown in FIG. 5, the inner pressing plate 29 is pulled to a position where it abuts on the locking rib 3b of the main cylindrical portion 3 of the syringe body 2 to stop the piston 23. Then
The notch 26 of the piston body 25 is positioned near the open end 3a of the syringe body 2. Then the piston 23
To the arrow C direction. For the syringe body 2,
By applying a force in the direction of arrow C to the piston 23, the piston body 25 is broken at the notch 26 formed in the piston body 25, which is structurally weak against bending stress. Is divided into a part on the arrow A side and a part on the arrow B side. Next, the broken portion of the syringe body 2 side and the portion of the outer pressing plate 27 of the piston 23 are discarded.
Since the injection needle 21 is completely inserted and stored in the inner space 2a of the syringe body 2 while being retained by the tip of the remaining piston 23, the injection needle 21 injures a hand or the like, There is less risk of secondary infections and therefore safe disposal. As described above, the operation of storing the injection needle is completed, and the use of the syringe 1 and the disposal after use are all completed.
【００１９】なお、上述の実施例においては、パッキン
３３には、該パッキン３３の矢印Ａ、Ｂ方向の移動によ
りテーパ部６に当接し得る端部３５ｄ即ち、係止部が形
成されており、また、表面３５ｅ即ち、押出し部が、端
部３５ｄとテーパ部６が当接する際に該表面３５ｅとテ
ーパ部６間に余裕空間５１が形成され得る形で形成され
ている。しかし、本発明による注射器或いは、ピストン
におけるパッキン３３の係止部は、端部３５ｄ以外の形
で形成されてもよい。例えば、パッキン３３に、図６に
示すように、該パッキン３３の矢印Ａ、Ｂ方向の移動に
よりテーパ部６に当接し得る形の係止突起５５を、パッ
キン３３のテーパ部３５ｂの表面側に形成して、該係止
突起５５を係止部としてもよい。該テーパ部３５ｂの係
止突起５５以外の表面３５ｅは押出し部となり、係止突
起５５とテーパ部６が当接する際には、該表面３５ｅ即
ち、押出し部とテーパ部６間には余裕空間５１が形成さ
れ得る。In the above-described embodiment, the packing 33 is formed with the end portion 35d, that is, the locking portion, which can come into contact with the taper portion 6 by the movement of the packing 33 in the directions of arrows A and B. Further, the surface 35e, that is, the extruded portion, is formed in such a manner that a margin space 51 can be formed between the surface 35e and the tapered portion 6 when the end portion 35d and the tapered portion 6 contact each other. However, the locking portion of the packing 33 in the syringe or the piston according to the present invention may be formed in a shape other than the end portion 35d. For example, as shown in FIG. 6, on the packing 33, a locking projection 55 that can come into contact with the tapered portion 6 by the movement of the packing 33 in the directions of arrows A and B is provided on the surface side of the tapered portion 35b of the packing 33. Alternatively, the locking protrusion 55 may be formed as a locking portion. The surface 35e of the taper portion 35b other than the locking projection 55 is a push-out portion, and when the locking projection 55 and the taper portion 6 come into contact with each other, a surplus space 51 is formed between the surface 35e, that is, between the push-out portion and the taper portion 6. Can be formed.
【発明の効果】以上説明したように、本発明のうち第一
の発明は、主円筒部３等の筒部を有し、前記筒部の先端
側に、該筒部の内径よりも小なる内径をもつ筒状のハブ
挿着部４等のハブ挿着部を、該筒部と該ハブ挿着部との
間にテーパ部６等の連絡部を形成する形で設け、前記ハ
ブ挿着部にハブ９等のハブを着脱自在に挿着して設け、
前記ハブの前記筒部に背向した側に注射針２１等の注射
針を接合して設け、前記ハブの前記筒部に対向した側に
ピストン係合孔１５等のハブ側係合手段を設け、前記筒
部にピストン本体２５等のピストン本体を、該筒部の内
部に挿入された形で設け、前記ピストン本体にハブ係合
部３１等のピストン側係合手段を、前記ハブのハブ側係
合手段に対向する形で、該ハブ側係合手段に対して挿入
係合自在に設け、前記ピストン本体に弾性材料により形
成されたパッキン３３等の閉塞手段を、該閉塞手段が前
記筒部の内部を矢印Ａ、Ｂ方向等の軸方向に閉塞すると
ともに、前記筒部に対して、前記ピストン本体と共に軸
方向に摺動移動自在に設け、前記閉塞手段に、該閉塞手
段の前記軸方向の移動により前記連絡部に当接し得る端
部３５ｄ、係止突起５５等の係止部を形成し、前記閉塞
手段に表面３５ｅ等の押出し部を、前記係止部と前記連
絡部が当接する際に、該押出し部と前記連絡部間に余裕
空間５１等の隙間空間が形成され得る形で形成して構成
したので、注射針収納動作において、注射終了位置から
ピストン本体をハブ側に押圧してピストン側係合手段を
更にハブ側に送り出す際、閉塞手段は、係止部付近にお
いて当接している連絡部から反力を受けて軸方向に圧縮
され、しかも押出し部が隙間空間を狭める形で即ち、連
絡部に向かって接近する形でハブ側に押し出される。つ
まり、隙間空間において押出し部がハブ側に押し出され
る分だけ閉塞手段の圧縮量は軽減されており、ピストン
側係合手段の送り出しは極力小さな力で可能となる。従
って、注射針収納動作は容易に行われる。また、本発明
のうち第二の発明は、第一の発明の注射器で使用するピ
ストン２３等のピストンにおいて、前記ピストンはピス
トン本体２５等のピストン本体を有し、前記ピストン本
体の先端側にハブ係合部３１等のピストン側係合手段
を、前記ハブ側係合手段に対して挿入係合自在に設け、
前記ピストン本体に弾性材料により形成されたパッキン
３３等の閉塞手段を、該閉塞手段が主円筒部３等の前記
筒部の内部を矢印Ａ、Ｂ方向等の軸方向に閉塞し得ると
もに、前記筒部に対して、前記ピストン本体と共に軸方
向に摺動移動自在に設け、前記閉塞手段に、該閉塞手段
の前記筒部に対する前記軸方向の移動によりテーパ部６
等の前記連絡部に当接し得る端部３５ｄ、係止突起５５
等の係止部を形成し、前記閉塞手段に表面３５ｅ等の押
出し部を、前記係止部と前記連絡部が当接する際に、該
押出し部と前記連絡部間に余裕空間５１等の隙間空間が
形成され得る形で形成して構成したので、第一の発明の
注射器に該ピストンを適用することにより、第一の発明
と同様の効果を生む。As described above, the first aspect of the present invention has the cylindrical portion such as the main cylindrical portion 3 and is smaller than the inner diameter of the cylindrical portion on the tip side of the cylindrical portion. A hub insertion portion such as a tubular hub insertion portion 4 having an inner diameter is provided so as to form a connecting portion such as a taper portion 6 between the tubular portion and the hub insertion portion, and the hub insertion portion A hub such as the hub 9 is detachably attached to the section,
An injection needle such as an injection needle 21 is provided on the side of the hub facing the tube portion, and a hub side engaging means such as a piston engagement hole 15 is provided on the side of the hub facing the tube portion. A piston main body such as a piston main body 25 is provided in the cylindrical portion so as to be inserted inside the cylindrical portion, and a piston side engaging means such as a hub engaging portion 31 is provided in the piston main body on the hub side of the hub. The closing means is provided so as to be inserted into and engageable with the hub side engaging means so as to be opposed to the engaging means, and the closing means such as a packing 33 formed of an elastic material on the piston body is the cylindrical portion. Is closed in the axial direction such as the arrow A and B directions and is slidably movable in the axial direction together with the piston body with respect to the tubular portion, and the closing means is provided in the axial direction of the closing means. End portion 35d that can come into contact with the connecting portion by the movement of the When a locking portion such as 55 is formed and a pushing portion such as the surface 35e is brought into contact with the closing means and the locking portion and the communication portion come into contact with each other, a marginal space 51 or the like is formed between the pushing portion and the communication portion. Since the gap space is formed so that it can be formed, when closing the injection needle, the piston main body is pushed toward the hub side from the injection end position and the piston side engaging means is further sent to the hub side. , Is compressed in the axial direction by receiving a reaction force from the contacting portion in the vicinity of the locking portion, and the push-out portion is pushed out to the hub side in a form of narrowing the clearance space, that is, in a form of approaching the connecting portion. . In other words, the amount of compression of the closing means is reduced by the amount that the pushing portion is pushed out to the hub side in the clearance space, and the piston side engaging means can be fed out with the smallest possible force. Therefore, the needle accommodating operation is easily performed. The second invention of the present invention is the piston such as the piston 23 used in the syringe of the first invention, wherein the piston has a piston body such as a piston body 25, and a hub is provided on the tip side of the piston body. Piston-side engaging means such as the engaging portion 31 is provided so as to be insertably engaged with the hub-side engaging means,
The closing means such as a packing 33 formed of an elastic material on the piston body can close the inside of the cylindrical portion such as the main cylindrical portion 3 in the axial direction such as the arrow A and B directions. Along with the piston body, it is slidably movable in the axial direction with respect to the tubular portion, and the taper portion 6 is provided in the closing means by the axial movement of the closing means with respect to the tubular portion.
End portion 35d capable of abutting on the connecting portion such as
When a pushing portion such as the surface 35e is formed on the closing means and the engaging portion and the connecting portion are in contact with each other, a gap such as a margin space 51 is formed between the pushing portion and the connecting portion. Since the space is formed so that the space can be formed, by applying the piston to the syringe of the first invention, the same effect as that of the first invention can be obtained.
以下、本発明の実施例を図面に基づき説明する。 Embodiments of the present invention will be described below with reference to the drawings.
【図１】図１は、本発明による注射器の一例のうちハブ
及びピストンの先端付近を示した断面図である。FIG. 1 is a cross-sectional view showing the vicinity of a hub and a tip of a piston in an example of a syringe according to the present invention.
【図２】図２は、図１に示す注射器の全体を示す模式断
面図である。FIG. 2 is a schematic cross-sectional view showing the entire injector shown in FIG.
【図３】図３は、図２に示す注射器のハブ挿着部付近の
図である。FIG. 3 is a view in the vicinity of a hub insertion portion of the syringe shown in FIG.
【図４】図４は、図２に示す注射器のハブ挿着部を矢印
Ｂ方向に見た図である。FIG. 4 is a view of the hub insertion portion of the syringe shown in FIG. 2 as seen in the direction of arrow B.
【図５】図５は、図２に示す注射器におけるピストンの
折取り作業工程を示した図である。FIG. 5 is a diagram showing a piston breaking operation process in the injector shown in FIG. 2;
【図６】図６は、本発明による注射器の別の一例を示し
た断面図である。FIG. 6 is a sectional view showing another example of the syringe according to the present invention.
【図７】図７は、従来提案されている使い捨て注射器の
一例におけるシリンジ、ピストン間の位置関係を示した
模式図である。FIG. 7 is a schematic diagram showing a positional relationship between a syringe and a piston in an example of a conventionally proposed disposable syringe.
１……注射器 ３……筒部（主円筒部） ４……ハブ挿着部 ６……連絡部（テーパ部） ９……ハブ １５……ハブ側係合手段（ピストン係合孔） ２１……注射針 ２３……ピストン ２５……ピストン本体 ３１……ピストン側係合手段（ハブ係合部） ３３……閉塞手段（パッキン） ３５ｄ……係止部（端部） ３５ｅ……押出し部（表面） ５１……隙間空間（余裕空間） ５５……係止部（係止突起） 矢印Ａ、Ｂ方向……軸方向 1 ... Syringe 3 ... Cylindrical part (main cylindrical part) 4 ... Hub insertion part 6 ... Communication part (taper part) 9 ... Hub 15 ... Hub side engaging means (piston engaging hole) 21 ... ... injection needle 23 ... piston 25 ... piston main body 31 ... piston side engaging means (hub engaging part) 33 ... closing means (packing) 35d ... locking part (end part) 35e ... extruding part ( Surface: 51 ... Gap space (margin space) 55: Locking part (locking protrusion) Arrows A, B direction: Axial direction
Claims (2)
もつ筒状のハブ挿着部を、該筒部と該ハブ挿着部との間
に連絡部を形成する形で設け、 前記ハブ挿着部にハブを着脱自在に挿着して設け、 前記ハブの前記筒部に背向した側に注射針を接合して設
け、 前記ハブの前記筒部に対向した側にハブ側係合手段を設
け、 前記筒部にピストン本体を、該筒部の内部に挿入された
形で設け、 前記ピストン本体にピストン側係合手段を、前記ハブの
ハブ側係合手段に対向する形で、該ハブ側係合手段に対
して挿入係合自在に設け、 前記ピストン本体に弾性材料により形成された閉塞手段
を、該閉塞手段が前記筒部の内部を軸方向に閉塞すると
ともに、前記筒部に対して、前記ピストン本体と共に軸
方向に摺動移動自在に設け、 前記閉塞手段に、該閉塞手段の前記軸方向の移動により
前記連絡部に当接し得る係止部を形成し、 前記閉塞手段に押出し部を、前記係止部と前記連絡部が
当接する際に、該押出し部と前記連絡部間に隙間空間が
形成され得る形で形成して構成した注射器。1. A tubular hub insertion portion having a tubular portion and having an inner diameter smaller than the inner diameter of the tubular portion is provided at the tip end side of the tubular portion, the tubular portion and the hub insertion portion. A hub is detachably inserted into the hub insertion portion, and an injection needle is attached to a side of the hub facing the cylinder portion. Hub side engaging means is provided on the side of the hub facing the tubular portion, a piston body is provided in the tubular portion in a form of being inserted into the tubular portion, and piston side engaging means is provided in the piston body. The hub side engaging means is provided so as to be opposed to the hub side engaging means so as to be insertably engageable with the hub side engaging means. The inside of the section is closed in the axial direction, and is provided so as to be slidable in the axial direction together with the piston body with respect to the tubular section. A locking portion is formed on the closing means so as to come into contact with the connecting portion by the movement of the closing means in the axial direction, and a push-out portion is brought into contact with the closing means and the connecting portion with the pushing portion. In this case, the syringe is formed so that a gap space can be formed between the pushing portion and the communication portion.
において、 前記ピストンはピストン本体を有し、 前記ピストン本体の先端側にピストン側係合手段を、前
記ハブ側係合手段に対して挿入係合自在に設け、 前記ピストン本体に弾性材料により形成された閉塞手段
を、該閉塞手段が前記筒部の内部を軸方向に閉塞し得る
ともに、前記筒部に対して、前記ピストン本体と共に軸
方向に摺動移動自在に設け、 前記閉塞手段に、該閉塞手段の前記筒部に対する前記軸
方向の移動により前記連絡部に当接し得る係止部を形成
し、 前記閉塞手段に押出し部を、前記係止部と前記連絡部が
当接する際に、該押出し部と前記連絡部間に隙間空間が
形成され得る形で形成して構成したピストン。2. The piston used in the syringe according to claim 1, wherein the piston has a piston main body, and the piston side engaging means is inserted into the tip end side of the piston main body with respect to the hub side engaging means. The closing means, which is provided so as to be engageable and which is formed of an elastic material on the piston body, can close the inside of the tubular portion in the axial direction, and the piston body and the shaft can be axially attached to the tubular portion. Provided slidably movable in a direction, the closing means is formed with a locking portion that can come into contact with the connecting portion by the movement of the closing means in the axial direction with respect to the cylindrical portion, and the closing means includes a push-out portion, A piston formed so that a gap space can be formed between the pushing portion and the connecting portion when the locking portion and the connecting portion come into contact with each other.
Priority Applications (13)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5237439A JPH08134B2 (en) | 1993-08-30 | 1993-08-30 | Syringe and piston used in the syringe |
| EP94109617A EP0633036A1 (en) | 1993-06-29 | 1994-06-22 | Retractable needle syringe |
| CA002126478A CA2126478A1 (en) | 1993-06-29 | 1994-06-22 | Hub for syringe, connecting structure of hub, syringe, piston, needle assembly unit, connecting structure between needle assembly unit and syringe, syringe of assembling syringe assembly assembly and method |
| AU65976/94A AU679521B2 (en) | 1993-06-29 | 1994-06-24 | Hub for syringe, connecting structure of hub, syringe, piston, needle assembly unit, connecting structure between needle assembly unit and syringe, syringe assembly and method of assembling syringe assembly |
| KR1019940014916A KR950000172A (en) | 1993-06-29 | 1994-06-27 | Hub for syringe, hub connection structure, syringe, piston, needle unit, tooth needle unit and syringe connection structure, syringe and syringe assembly method |
| TW083108315A TW287951B (en) | 1993-06-29 | 1994-09-09 | |
| TW084108858A TW278044B (en) | 1993-06-29 | 1994-09-09 | |
| US08/614,632 US5879339A (en) | 1993-06-29 | 1996-03-13 | Hub for syringe, connecting structure of hub, syringe, piston, needle assembly unit, connecting structure between needle assembly unit and syringe, syringe assembly and method of assembling syringe assembly |
| US08/667,858 US5788672A (en) | 1993-06-29 | 1996-06-20 | Hub for syringe, connecting structure of hub, syringe, piston, needle assembly unit, connecting structure between needle assembly unit and syringe, syringe assembly and method of assembling syringe assembly |
| US08/685,110 US5716341A (en) | 1993-06-29 | 1996-07-23 | Hub for syringe, connecting structure of hub, syringe, piston, needle assembly unit, connecting structure between needle assembly unit and syringe, syringe assembly and method of assembling syringe assembly |
| AU65811/96A AU691123B2 (en) | 1993-06-29 | 1996-09-24 | Hypodermic needle assembly for a syringe |
| AU12461/97A AU686963B2 (en) | 1993-06-29 | 1997-01-31 | Needle hub for disposable syringe and syringe assembly |
| AU39893/97A AU3989397A (en) | 1993-06-29 | 1997-10-02 | Syringe assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5237439A JPH08134B2 (en) | 1993-08-30 | 1993-08-30 | Syringe and piston used in the syringe |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0759854A JPH0759854A (en) | 1995-03-07 |
| JPH08134B2 true JPH08134B2 (en) | 1996-01-10 |
Family
ID=17015379
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5237439A Expired - Fee Related JPH08134B2 (en) | 1993-06-29 | 1993-08-30 | Syringe and piston used in the syringe |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH08134B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59176139U (en) * | 1983-05-11 | 1984-11-24 | エルナ−株式会社 | Chip type electrolytic capacitor |
-
1993
- 1993-08-30 JP JP5237439A patent/JPH08134B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59176139U (en) * | 1983-05-11 | 1984-11-24 | エルナ−株式会社 | Chip type electrolytic capacitor |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0759854A (en) | 1995-03-07 |
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